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CVE-2026-55618— eml_parser: URL extraction bypass via HTML entities in URLs

Quick assessment

Affected
GOVCERT-LU eml_parser
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

eml_parser 是一个用于解析 .eml 文件并将其中的各种信息以及计算得出的信息作为结果返回的 Python 模块。在 3.0.2 版本之前，eml_parser/parser.py 中的 clean_found_uri 函数在处理前会先对潜在 URL 字符串进行验证，而未对用于表示冒号、斜杠或句点的 HTML 实体进行解码。这导致有效的编码 URL 及其主机名被错误地拒绝，并未能纳入提取出的 URL 和域名列表中。由于电子邮件安全网关和 SOC（安全运营中心）流水线依赖这些列表作为入侵指标（Indicat

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1566.001 · Spearphishing Attachment

Affected Version Matrix 1

VendorProduct Version RangeStatus
GOVCERT-LU eml_parser < 3.0.2 affected
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I. Basic Information for CVE-2026-55618

Vulnerability Information
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Vulnerability Title
eml_parser: URL extraction bypass via HTML entities in URLs
Source: CVE Program / CVE List V5
Vulnerability Description
eml_parser serves as a python module for parsing eml files and returning various information found in the e-mail as well as computed information. Prior to 3.0.2, the clean_found_uri function in eml_parser/parser.py validates potential URL strings before unescaping HTML entities used for colon, slash, or period characters. Valid encoded URLs and their host names are therefore rejected and omitted from the extracted URL and domain lists. Email security gateways and SOC pipelines that use those lists as indicators of compromise may fail to submit the hidden URLs to threat intelligence feeds, reputation services, or sandboxes, allowing malicious links to bypass inspection. This issue is fixed in version 3.0.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对输出编码和转义不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
GOVCERT-LU eml_parser < 3.0.2 -

II. Public POCs for CVE-2026-55618

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III. Intelligence Information for CVE-2026-55618

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Patches & Fixes for CVE-2026-55618 (3)

Vendor Advisories for CVE-2026-55618 (1)

Same Patch Batch · GOVCERT-LU · 2026-08-25 · 3 CVEs total

CVE-2026-55620 7.5 HIGH eml_parser: DoS via deeply nested parens in Received headers
CVE-2026-55619 5.3 MEDIUM eml_parser: Parser DoS via deeply nested parentheses in e-mail headers

IV. Related Vulnerabilities

Same product: eml_parser
Same vendor: GOVCERT-LU
Same weakness: CWE-116

V. Comments for CVE-2026-55618

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